如何在Visual Studio 2012 Visual c ++中动态分配内存

Question

我想为大小为"n"的int数组分配内存.我用过

int *Money = new int[n];

并且

int *Money = (int*) malloc(n*sizeof(int))

但都没有奏效.在程序期间,我从文件"Test.txt"中读取并填充数组.但是在调试时,我总是只看到Money数组中的一个条目(第一个),其大小为1.这里与其他动态分配的数组的情况相同.

我怎样才能让它发挥作用？

#include<cstdio>
#include<cstdlib>
#include<assert.h>

int *Money;
int *Earn;
int *Sorted;
int *R1;
int *R2;
bool *Visited;
int visited;

void TSort(int room, int n);

int main(){
    FILE *in=fopen("Test.txt","r");
    int n,ind=0,money,r1=0,r2=0;
    char room1[7], room2[7];
    fscanf(in,"%d",&n);
    printf("%d\n",n);
    Money = (int*) malloc((n+1)*sizeof(int));
    Sorted = (int*) malloc((n+1)*sizeof(int));
    Sorted[n] = n;
    R1 = (int*) malloc(n*sizeof(int));
    R2 = (int*) malloc(n*sizeof(int));
    Visited = (bool*) malloc((n+1)*sizeof(bool));
    Earn = (int*) malloc((n+1)*sizeof(int));
    visited=0;

/* In this for loop I read in the input from the said file */

    for(int i=0;i<n;i++){
        fscanf(in,"%d %s %s",&money, room1, room2);
        Money[i]=money;
        Earn[i] = -1;
        if(room1[0] == 'E')
            R1[i] = n;
        else{
            int j=0;
            r1=0;
            while (room1[j]){
                r1 = 10*r1 + (room1[j]-48);
                j++;
        }
            R1[i] = r1;
        }
        if(room2[0] == 'E')
            R2[i] = n;
        else{
            int j=0;
            r2=0;
            while (room2[j]){
                r2 = 10*r2 + (room2[j]-48);
                j++;
            }
            R2[i] = r2;
        }
        Visited[i]=false;
    }

/* Reading and initializations end */

    Earn[0] = Money[0];
    TSort(0,n);
    for(int i=0; i<n; i++){
        assert(Earn[Sorted[i]] != -1);
        int curr=Sorted[i];
        int r1 = R1[curr];
        int r2 = R2[curr];
        int possible = Earn[curr] + Money[r1];
        if(possible > Earn[r1]) Earn[r1] = possible;
        possible = Earn[curr] + Money[r2];
        if(possible > Earn[r2]) Earn[r2] = possible;
    }
    printf("%d\n",Earn[n]);
    getchar();
    return 0;
}

void TSort(int room, int n){
while(visited<n){
        Visited[room] = true;
        Sorted[visited] = room;
        visited++;
        if((R1[room] != n)&&(!Visited[R1[room]])) TSort(R1[room],n);
    if(((R2[room] != n))&&(!Visited[R2[room]])) TSort(R2[room],n);
    }
return;
}

Answer 1

这个是正常的.变量是指向第一个元素的指针.IDE并不真正知道它是一个数组.

在变量上加上一个观察点,并通过向它添加一个数字告诉IDE你想看到更多.

Money, 5

那应该向你展示分配的前5个要素.

怎么样？我必须从记忆中做到这一点.

在调试菜单下,您可以打开各种窗口.应该有一个或多个手表窗.打开其中一个.

转到源代码中的变量,然后双击选择变量名称.将其拖入观察窗口然后放开.

然后单击监视窗口中的变量.编辑该值,在其后面加上逗号5.按回车键.

应该做的伎俩.